<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 1.引入vue.js -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>

<body>
    <!-- 2.将vue实例渲染到DOM节点上 -->
    <div id="app">{{ message }}</div>

    <script>
        // 3.new一个vue实例
        let app = new Vue({
            el: '#app',
            data: {
                message: '你好!'
            }
        })
    </script>

</body>

</html>